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<h3>Hypertext Help with LaTeX</h3>

<h2>\lefteqn</h2>

<p><tt>\lefteqn{eqn}</tt></p>

<p>Prints <tt>eqn</tt> in display math style, but pretends that
    it has zero width. It is typicaly used within an
    <tt><a href="ltx-223.html">Eqnarray</a></tt> environment for
    displaying long equations that require multiple lines.</p>

<p>A typical use might be</p>

<pre>
    \begin{eqnarray}
    \lefteqn{\int_0^<a href="ltx-407.html">\infty</a> some expression =} \\
    & & some terms <a href="ltx-181.html">\\</a>
    & & <a href="ltx-265.html">\mbox{}</a> + more terms
    \end{eqnarray}
</pre>

<p>Note that the empty
    <tt><a href="ltx-265.html">\mbox{}</a></tt> is so LaTeX knows
    that the following <tt>+</tt> is a binary operator, and is not
    attached to the first of the "more terms" as a unary operator.</p>

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<p>
    Related topics
</p>

<ul>
    <li><a href="ltx-27.html">Environments</a></li>
    <li><a href="ltx-202.html">Array Environment</a></li>
    <li><a href="ltx-223.html">Eqnarray Environment</a></li>
    <li><a href="ltx-224.html">Equation Environment</a></li>
    <li><a href="ltx-421.html">Displaymath Environment</a></li>
    <li><a href="ltx-115.html">Math Formulas</a></li>
</ul>

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<address>
    Revised 29 Jun 1995.
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